On the topic of belly pans, here's an excellent look at a Lotus Elise full undertray. The circumstances permitting such a clear shot are unfortunate, though!
Sorry to dig this up (the thread was revived :P)... But that happened literally 5 minutes away from me :D There's actually a really great surplus store just down the road from there :P
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I'm pretty sure I need to revise the rear up angle.
What would be optimum? I've found quite a bit of conflicting research on the subject of diffusers :P